An alternate way to force Mango update

I have a brand new Samsung Focus, v1.3, 7390. No matter what I did, the trick floating around didn't work. But my wife's Focus, which was on Mango RTM, got a notice to update on day 1. So I got the thinking, maybe MS has prioritzed those on RTM and Beta? So I decided to bring my phone to beta using XDA method. So if you're not willing to wait and don't care about loss of data, here is what I did: